DOI: 10.1002/joc.5547
论文题名: Spatial and temporal patterns of rainfall variability and its relationship with land surface phenology in central east Argentina
作者: Celleri C. ; Zapperi G. ; González Trilla G. ; Pratolongo P.
刊名: International Journal of Climatology
ISSN: 8998418
出版年: 2018
卷: 38, 期: 10 起始页码: 3963
结束页码: 3975
语种: 英语
英文关键词: climatic transition
; ENSO
; land surface phenology metrics
; NDVI
; rainfall variability
; vegetation response
Scopus关键词: Atmospheric pressure
; Climatology
; Surface measurement
; Vegetation
; climatic transition
; ENSO
; Land surface phenology
; NDVI
; Rainfall variability
; Vegetation response
; Rain
; El Nino-Southern Oscillation
; land surface
; NDVI
; phenology
; rainfall
; spatial analysis
; temporal analysis
; vegetation dynamics
; water availability
; Argentina
; Bos
英文摘要: Transition zones between dry and humid climates are highly sensitive areas where small changes in the spatial and temporal distribution of rainfall may have vast consequences on vegetation development. Rainfall regimes are expected to change worldwide and predictions include variations in total annual precipitation and timing of rain events. In this context, evaluating the relationship between vegetation activity and rainfall variability along transition zones is particularly relevant. In this study, 54 years (1961–2013) of gridded monthly rainfall data (Climatic Research Unit Time-Series Version 3.22 [CRU TS3.22]) were used to analyse annual and inter-annual rainfall variability. Land surface phenology (LSP) metrics (2000–2013) were derived from MODIS 16-day composites Normalized Difference Vegetation Index (NDVI) data (MOD13Q1 product) and relationship between rainfall variability and LSP metrics was assessed. Annual rainfall showed a strong seasonality in the northeast of the study area that diminishes towards the southwest. Inter-annual rainfall variability, which showed a significant 8-year cycle periodicity after 1980, was stronger in the southwest of the region. For most of the study area, summer rainfall (November–January) showed significant negative correlation with August–October Southern Oscillation Index (SOI) average, although this connection was not reflected in annual precipitation totals. Regarding vegetation response to rainfall variability, two main areas were identified where differences in LSP metrics between wet and dry years were larger than the average. The first one was a zone within the humid to semi-arid transition belt, where NDVI maximum, NDVI amplitude and NDVI integral showed higher values during wet years. The second one was the central north area, which showed higher NDVI amplitude values during dry years. In the study area, water availability is a sensitive issue for natural ecosystems, agriculture and cattle-raising. These results provide a better understanding of the relationship between rainfall variability and vegetation changes, which is useful information for the development of future management policies. © 2018 Royal Meteorological Society Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/116812
Appears in Collections: 气候减缓与适应
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作者单位: Instituto Argentino de Oceanografía (IADO), Universidad Nacional del Sur (UNS)-CONICET, Bahía Blanca, Argentina; Departamento de Biología, Bioquímica y Farmacia, Universidad Nacional del Sur, Bahía Blanca, Argentina; Laboratorio de Ecología, Teledetección y Eco-Informática, Instituto de Investigaciones e Ingeniería Ambiental Universidad Nacional de San Martín, San Martín, Argentina; Consejo Nacional de Investigaciones Científicas y Técnicas (CONICET), Buenos Aires, Argentina
Recommended Citation:
Celleri C.,Zapperi G.,González Trilla G.,et al. Spatial and temporal patterns of rainfall variability and its relationship with land surface phenology in central east Argentina[J]. International Journal of Climatology,2018-01-01,38(10)